Should Lawyers Defend The Guilty?

I believe that no they shouldn't , i wouldn't but this is me! The problem lie's on the fact that a lot of lawyers make their money by representing the guilty , and "some ones got to do it". In this country everyone has the right to a fair trial and if u'r poor u get one appointed to u, this is atated in the constitution. Maybe u represent someone and u don't know they are guilty mabe lawyers who represent the the guilty are able to keep doing soo because thet believe in themselves or pretend their clients are not guilty when they are. I guess it isn't soo horrible to represent the guilty when they have put all their confidence, trust and money in u.